- Cold
water :- 700ml
- Sodium
thiosulphate anhydrous :- 120 grammes Dissolve thoroughly, then add
this solution :
- Water
at 70 C :- 200ml
- Potassium
alum crystal :- 30 grammes Slowly add the following, you must include
the milk-like precipitate, while stirring rapidly :
- Cold
water :- 20ml.
- Silver
Nitrate crystal :- 1 gramme.
- Sodium
Chloride :- 1 gramme.
- Water
to :- 1000ml.
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